nl

Question 1

nl

Answer 1

Write each FILE to standard output, with line numbers added.

Question 2

nl -b

• d
• f
• h
• i
• l

Answer 2

• b, –body-numbering=STYLE, Use STYLE for numbering body lines.
• d, –selection-delimiter=CC, Use CC for logical page delimiters.
• f, –footer-numbering=STYLE, Use STYLE for numbering footer lines.
• h, –header-numbering=STYLE, Use STYLE for numbering header lines.
• i, –line-increment=NUMBER, Line number increment at each line.
• l, –join-blank-lines=NUMBER, Group of NUMBER empty lines counted as one.

Question 3

nl

• n
• p
• s
• v
• w

Answer 3

• n, –number-format=FORMAT, Insert line numbers according to FORMAT.
• p, –no-renumber, Do not reset line numbers for each section.
• s, –number-separator=STRING, Add STRING after (possible) line number.
• v, –starting-line-number=NUMBER, Use NUMBER columns for line numbers.
• w, –number-width=NUMBER, Use NUMBER columns for line numbers.

Question 4

nl

[CC]

[STYLE]

[FORMAT]

Answer 4

[CC] are two delimiter characters used to construct logical page delimiters; a missing second character implies ‘:’.

[STYLE] is one of:

a, Number all lines

t, Number only nonempty lines.

n, Number no lines.

pBRE, Number only lines that contain a match for the basic regular expression.

[FORMAT] is one of:

ln, Left justified, no leading zeros.

rn, Right justified, no leading zeros.

rz, Right justified, leading zeros.